Is Your Soil Starving for Calcium? Here's 9 Best Ways to add Calcium …
This is calcium carbonate, a form of lime from mined limestone. Lime is one of the biggest calcium boosters that also raises the soil pH (making it more alkaline). You can use a lime calculator to determine how much you need in your garden. Dolomite Lime. This is another form of calcium carbonate that also has magnesium carbonate in it.